A competing family is tested from 10 % to 55 % propylene glycol. No ingress protection rating
is published in this category.
Step 2 / Locating or non-locating
Settle it on the cost of searching
Capacity tiers and what the panel reports.
Parameter
Published
Cable per controller
305 m · 1,524 m · 3,048 m
Minimum usable length
10.67 m, distance-read
Virtual zones
32 per controller
Sub-controllers, head end
127
Non-locating report
Zone
Distance-read report
Metre
Step 3 / Siting
One clearance and two spacings
Clearance, spacing, cable limits.
Rule
Figure
Clearance, downflow air
1.8 m
Alarm rate inside it
twice a day, no leak
Clips
3–4 ft · about 1 m
Caution tags
10 ft · 3 m
305 m run
250–330 clips, 100 tags
Bend radius · temp.
12.70 mm · 0–75 °C
Plenum rating
CL2P
Siting plan
Step 4 / Thresholds
Why a dirty cable and a wet cable look the same
Published currents, distance-read class.
Signal
Current
Held
Water on cable
about 300 µA
—
Leak setpoint
150 µA
20 s
Contamination point
50 µA · 25–300 adj.
120 s
Field contamination
1–300 µA
—
Clean cable
15 mA and below
—
Cable current
Solder flux, floor-sealing chemicals, metallic swarf and a dropped floor tile all push current
into that band.
Step 5 / Commissioning and redundancy
Set thresholds against the site
Set them at commissioning, against the site. The published trade-off: a low threshold for
mission-critical areas, a higher one to suppress condensation nuisance alarms.
Two-of-two
Setting
Distance-read
Single-zone
Response time
5–990 s, 5 s steps, ±2 s
10 s or 2 min, ±10 %
Probe height
0–4.8 mm · 4.27 m leader
—
Step 6 / Accessories, from the run
The cable is not the system
Worked: 300 m across two rows, one controller.
Bill of materials for that run.
Item
Status
Quantity
Code
Leader cable, 4.57 m
mandatory
1 per controller
EMS-LD-T2
Terminator
mandatory
1 per loop
EMS-LD-T1
Clips, about 1 m
mandatory
about 300
EMS-LD-T3
Caution tags, 3 m
mandatory
about 100
EMS-LD-T4
Jumper, 3.05 m
conditional, per crossing
1 each
EMS-LD-X15
Without the terminator there is no cable-break supervision. A distance-read panel averages two
simultaneous wet points, so a crossing takes a jumper.
The honest version of the headline number
Position resolution is not locating repeatability
Three parameters, in this order. They never share a row.
Parameter
Published value
Position resolution
0.1 m — printed granularity
Locating accuracy
±0.6 m plus 0.5 % of length
Locating repeatability
±0.6 m plus 0.25 % of length
Bands at full length
On a 3,048 m cable the 0.5 % term alone is 15 m. Buy resolution for the map, repeatability for
the second visit.
Specification pack
One datasheet per model code
Rope, probe, controller and accessory codes resolve to a specification table.
